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A vertex set is a double – dominating set, if each vertex is adjacent to at least two vertices in . The minimum cardinality of a double dominating set of G, denoted by is called the double domination number of G. A double dominating set S of a graph is an inverse double dominating set, if contains a double dominating set say of . Then is called an inverse double dominating set. The inverse double domination number of is the minimum cardinality of an inverse double dominating set. In this paper, we obtain exact value of for some standard graphs and also, we establish some general results on this parameters. DOI: https://doi.org/10.52783/tjjpt.v45.i03.7347
Vinodh Kumar A. R. (Thu,) studied this question.